BK PRECISION 1660 Instruction 电路图.pdf

Triple Output DC POWER SUPPLY dlt*rur#ffi.i B a. If the equipment utde! test is the hot chassis, tvDe. a selious shock hazard exists unless tbe equipEent is uDplugged (usi turning off the equipment does aot remove the hazard), o! the plecautions ot Jtep g are observed. b. If the equipbeDt under test is powered upi (arxd that equipEent uses high voltage in ary of its cilcuits), the polve! supply outputs may be floated to the potential at the point of connection, Remeober that high volta_ge Inay appea! at unexpected points in defective equipbeot. Do llot float tbe po.re! supply output to more tban 100 voit; peak with lespect to chassis or earth ground. c. If ttre equiproent under test is ,off, (and tbat equipEent uses high vol_ tage ilr aIly oI its circuits unde! nornra.I opelatiotr), discbalge higb_ voltage capacitors before baking coDnectioDs or tests. SoEe cilcuits retaiD high voltage long after the equipraeDt is tuDed off, Z. Use olly a poladzed 3-wi!e ac outlet. This assures that the powe! supply cha6sis, case, and ground telrainal ale conlected to a good eartir Stounil anil reduces dange! florD electlical shoclg 3. DoDt expose high vottage neetllessly. Remove bousiags aDd covels only whea neceasaly, Tra off equipEet while Eaking test coDnectioDs in higb-voltage cilcuits. Discbarge higb-voltage capacitols after reEoring powe!. 4. lf possible, faEiliafize youlseu with the equipE ent beiDg testeal and the lc_ cation of its high voltage points. However, letlembe! tbat high voltage Dlay appear at rEerpected poiuts in delective equipmert. waRl|ltc codtinued oa inside rear cover) B industrial Pro- duction testing of coDrponents assemblis, and collplete equipment; fo! school labolatolies, and home use bv electronic hobbyists. Ber CoDsurnptioD (FuIy Loaded): Lile Reguration 108 - l3z v (cstart ApproxiEately 320 4t CErent): < O.Z7o +3 EA. hotection: Revelse poladty protection and cur!ent Rilple Cr|f!ot (at 108 V Io! CoDstant liEiting. Crttfeot: < 3 IlA RMS. DiDeDsiors (E :< Y r D): 165 x 315 x 381 bra (12.4 x 15 x 6.5), Tbackiry (Sries): t1.Zqo +10 nV, Eeigbt: P?up leads, I !ed, I black. J0,5 % + 2 digits. Two ea.rth ground bus stlaps. Two 5A, 250V fuses (spares), ,F f r .li+:,. I E E I l3 l4 I8202125 26 1715 Fig. l. Front Panet Contlols And Indicatols. 1 1 . 13. Supply regulates the output culleDt at the va.Iue set by the IIASTER CURRENT control. In the Parallel Tracking Eodj when this indicato! is lit, both trle MASTER aJId SLAVE supplies are in rne Constant Current Eode. C.V. (CstaDt Voltage) Iadjcator. Green LED lights when the MASTER suppty is ir the Constant Voltage mode, The Power Supply regulates the output vot, tage at the value set by the MASTER VOLTAGE controls. ln erther the SeFies or Parallel Tracking Eode. when rhrs in- dicator is lit, both the MASTER alrd SLAVE supplies are in the CoDsta.nt Vol- tage mode, COARSE VOLTAGE Corttol. Codse adju.stment of the output vottage of the MASTER supply. Atso functjons a coarse adjustEenr coutlol fo! the maxi Eouh output voltage of the SLAVE supply when eithe! paraUel o! selis tracunp Eode is selected. Read the value on the MASTER/4.6.5 V I,ED Distrlay when the voltage iv) and master l(F30 V) Eeterins modes ale selected. FINE VOLTAGE Cmbol. Fine adrusr- ment of output volrage of the MASIIER supply. A160 firnctions as fine adjust- Dent control fo! the Ea-iEum outDut voltage of rhe SLAVE suppty when eitier palallel ol se es trackiDg mode is se- lected. Read the value on the MAS- aE.R/4.5 V IlD Display when the vol- tage rV) afld Daste ,(F30 l/ meterins IIrodes are selected. CURRENT Ctrol. Adjusts currenr Iimil of MASTER suppty in constant vol- tage rDode. Adjusts constant curlent value of MASTER supply in constant cuJ- lent mode. Cutrent can be aead ftolc the MASTER/4.6.5 V LED Display when the current A) and rDaster (F30 u metedng modes are selected, rz. B!, rent mode. Current can be .ead from the SLAVE LED Display wher the cur, lent (A) metering mode is selecled. 23. A/V SFitc-b. Selects current or voltage metering mode for tbe 0-30 V SLAVE supply, When in the A (aqlps) positiotl, culnt is lead from the SLAVE LED Display. When in the v (volts) position, voltage is read lrom the SLAVE I-ED Display. 24. SLAVE LED Display. Digitat disptay iddicates voltage or current at the 0-30 V sl-AvE supply (depending on the settiDg of the A/V switch), 25. + Tetbiaal (Red). positive potadty output telminal for the SLAVE suppty, In series tracking operation, this termi* nal is connected to the negative terminal of the MASTER supply. 26. cND TerEciDa.l (c!een). Ealth and Cha.ssis Ground. 27. - Terminal (Blact). Negative pot:rity output terminal fo! the SLAVE supply. AIso selves as the negative polarity te!- miDal Io 0-to-60 V series tracking opeF REAR PANEL CONTROLS 28. Fuse. 29. Line Cold B incoffect polarity loay daEage the equiprdent under test. Do not exceed tbe voltage rating ot the ci!- cuit being powered- Many transistots and integrated cilcuits will not *ithstand voltage There is tro $eed to wo!y about voltage spikes o! ovelshoot damagiDg the equipEent under test. The voltag between tbe output terEinal,s of the power supply neve! exceeds the preset value as the POWER switch is turtted on or off. INDEPENDENT USE OF I,ASTER OR .SLAVE SUPPLY The MASTER and SLAVE supplies each plovide a 0-to-30 volt output at up to 2.0 aDps. This plocedure covers the use of tbe MASTER ard SLAVE supplies only when they are used independently from one another. When used in the INDEPendent opelating mode, the opelatiEg contlols of the tro powe! supplies are colt|pletely independent and eithe! supply can be used ildividually o! both can be used sidultaneou.sly. Basic operation is covered be!e. Several vadations are covered in the APPLICATIONS section oI this Eanual. Eool-r) l. Diseugage both TRACKING mode switches (both switches out) so that the powe! supply is in the INDEPeDdent operating rbode. 2. TUrn off the power supply and the equipEent to be poweled during hook-up. 3. Condect the positive polarity of the device being powered to the red (+) teF llinal of the powe! supply. Obse!ve cautioD, Ii the power supply output is floated (lefelenced to a voltage ratbe! than earth grotllld) turn off the power supply a.Ild the equipEelt uDde! test when making connections. Never float the power supply to a potential gleat! than 100 volts peak with lespect to eattb ground EQIJIPXENT PRICAUTIO S Avoid rising the power supply in ambiert teEpelatures above +40 C. Always allow sufficient air space alound the heat sink at the lear of the powe! supply for effective ladia- tior to prevent internal heat build-ul. a sbock hazald B!i4 in ihi< c.rirl Set FINE VOLTAGE control to cnter and COARSE VOLTACE control ro:rin imu bench testiag of equipEent froE these systeEs should be pelforhed at 28 Soloe serviciug applications requile the in- jection of a vaiable dc voltage Io! celtain tests, such as checking the effect of AGC bias in a television receive!. This lequires an iso- lated dc powe! supply, such as the Modei 1660, The equipment being tested Eay co.- tain its own power supply and operate floE ac powe!. A dc voltage hay aheady be plesent in the cilcuit. Otre polarity of the power supply output is floated to an applopriate point in the cilcuit, such as the eljlitte! of a tlarsisto!. The other poladty of tle power supply output is then applied to alrothe! point in the cilcuit, such as the base of that traJl, sisto!, Varying the powe! supply voltage then vades tbe dc bias on the stage, ard the effects tDay be noteal A series lilrlitiDg lesistor is often used to protect the circuits froh oveF dissipation. ELECTROMCS MANUFACTIRING In electronics oaufactuling facilities, the power supply is oten used as a dc powe! soulce while testing aIld adjusting modules, subassexoblies, and cobplete tmits in the pro- duction and asseiobly alea o! in the quality control a!ea, The instluoent calr be used in incoming inspection as a dc power souice for testing pulchased cor:tponents and subasser:t- blies. This power supply is palticularly weU suited Ioi roanufactuling applications because of its ease of opelation and its continuous duty rating. When load curlent or total Fower dis- sipation ale aoong the maiD characteristics to be measure4 the total load current and vol- tage are easily displayed on the LED display. The current limit can be set so that all units ivbich do not lDeet the load culleDt specifica- tior will cause the CC indicator to light, aJId the unit can be lejected. ELECTRONICS DESIGN LAB The tecbnician or enginee! working in an engineeling laboratory requiles a dc powe! supply to powe! bleadboatd and plototype ci!- cuits, This power supply is ideal because rr bonitols output cuFent ajld voltage, limits zo Btu; ;qPq L; rcEi ,*, ! t r n n t C n L | ) t ) Fig, 11. T?ical Hook-Up Using Two Identical Positive Voitages anC a ! v u r ! u ! r r c t s d u v c . Two Dilfridg Positiye Voltages With a CoEood Negative (Refe! To Fig. 12) Many electronic circuits lequile two dif- ferent positive voltages with a common nega- tive. A tFical example of this would be a de, vice that uses both TTL (+5 V) and analog (t?ically +15 V) cilcuitry. Using both suppties, two differing positive voltages with a common negative are obtained as follows: l. Select the INDEPedent opelating mode and set up the LED displays so that both displays Donitor voltage, Z. Coinect the ground straps between each suppliesr negative terminal and glound. 3. Independentty set the desired voltage and maximulo cuirent for the MASTER and SLAVE supplies using the MASTER VOLTAGE and CURRENT contlots and the SLAVE VOLTAGE ald CURRENT 4. Turn off the power supply and the eqriipment to be powered during hook-up, 5. Connect the positive polarity inputs of the circuit to be powered to the positive (!ed) terrninal of the supply, Connect the cor!6orl negative input of the cilcuit to be powered to either of the supplys negative (black) or ground (8een) terminal. If desired, set the LED displays to moni-6. Fig. 12. T?ical Hook-Up Using Two Diffeling Positive Voltages and a Comlron Negative. Two Ideutical Negative Voltages With a ComEon Positire (Refe! To Fig. 13) When the same negative voltage is required at two points in the same circuit and a common positive is needed, pelform the fol1oring: 1. Connect the gro$d strap between the positive terrninal and the ground of the MASTER supply. Z. Set thF dFsiled voltage and maxiEum curlent using the MASTER VOLTAGE and CURRENT controls. 3. Turn off the powe! supply and the equipmeDt to be poweled during hook-up. 4, Connect the negative polarity inputs of the circuit to be poweled to the negative fblack) terhinals of the supplies. Con- zz B;l - l f - . t f r y t ,*l l - * t - = I I - I 110 V S_ = WIFENIJI 220 V 240 V Fig. 1?. Line Voltage Conveision. z5 Bve orspa,r PanelFronl Fig. 188. Location Of AdjustEents (Metering And Trackiag Boards), 17. 14. I6. Set the (F30 Vk-6.5 V switch to the 4-6.5 V position and the MASTER A,/V switch to the V position. Connect the multimeter across tle out- put terEinals of the ,F6.5 V SUPPLY to lead output voltag atrd adjust tne .1-6.5 V voltage level contlol to obtam a leading of 5,00 volts on the multimele!. Adjust trimmter potentiometer VR6OZ so tlat the MASTER/IF6.5 V LED Dispray Ieaals 5.0 volts. Set the ITASTER A/V switch to ttle A position, Connect a 1 0 load (lated at 30 W or more) across the output terminals of the ,F6.5 V SUPPLY and connect tle llutti- Beter to lead the output curlent. Adjust tle 4-6.5 V voltage tevel controt to obtain an output of 5.00 amps (read oD the multiEete!). Adjust trirlme! potentioDeter 1,rR603 so tha.t the MASTER/4-6.5 V LED Display also leads 5,00 amps. !R602 i F60l Vierr From Right Sid 0f Supply Fig, 18C, Location Of Adjustnents. Slave Supply Aud Metering AdjustEerlts 1. Connect an accurate (t0.1%) external +1/Z digf EultiEeter to Eeasule the dc vottage at the output telmidals of the SLAVE SUPPLY. 18. 20. z8 B and Eake certain such srjfaces are not da-mp o! wet, Use the tiEe-ploven one hand in the pocket tecbnique while haldling an instrubent probe. Be pa-ticularly careful to avoid contacting a rearby metal object that could ploeide a good ground retun path. When testing ac poweled eqdipment, reEeEtber that ac line voltage is usually preseit on sorle power input cilcuits such as the on-off switch, fuses, power tlansfolme!, etc. any tirae the equiprlert is comected to an ac outlet, even if the equipBent is tuhed off. Some equiphent with a two-wire ac power cord, includidg soroe v/ith polarized power plugs, is the hot chassis t1pe. This includes host recett television leceivers and audio equipErent. A plastic o! wooden cabinet insulates the chassis to plotect the custoBe!. When the cabinet is removed for selvicing, a serious shock hazard exists if the chassis is touched, Not only does this present a datrgelous shock hazard, but darlage to test instruments o! the equipment unde! test may lesult frolt connecting an ea.lth glound Iead of a test instruEent to a hot chassis. To rDak measurements in hot chassis equipEent, ahl,ays couect ajl isolatiolr tlanstorller between the ac outlet and the equiproent unde! test. The B & K-heci6ion Model TR-110 or 1604 Iso- Iation Transfolmer, or Model 1653 o! 1655 AC Power Supply is suitable for Eost applications. To be on the safe side, treat all two-wile ac powered equipbent as hot chassis unless you are sure it has an isolated chassis or ajl earth elound cbassis. B&K 1660 $A* g(F#DE-,J MASE9 INTEBIUATIOIIIAL ooFP. 6470 w Co-tb,d SL . Ct*raSs tL 60695 4ao-5a5-9-0010 O1988 MAXTEC tNTEFNAT|oNAL coRp. Pf nld in Taiwan ROC B&K 1660 B&K 1660 B&K 1660 B&K 1660 B&K 1660 B&K 1660 B&K 1660 B&K 1660 B&K 1660